One of the major motifs that runs through Antigone's story is burial. (Yeah, she's kind of a morbid girl. But we dig her anyway. Ha!) First, we see her supporting Oedipus, while everybody's fighting over where he'll be buried after he dies. Later, she defies Creon by insisting on burying her brother, Polyneices. Then as a punishment, Creon has her buried alive. Wow, you kind of can't blame Antigone for being a morbid. For Antigone, death has always lurked just below her feet.
For more details on how this motif pops up in Sophocles' Antigone click here.